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The following are reputable publishers who specialize in Religious Studies texts:
Abingdon Press (United Methodist)
Augsburg Fortress (Evangelical Lutheran Church in America)
Baker Book House
Chalice Press (Disciples of Christ)
Eerdmans Publishing Co.
Judson Press (American Baptist)
Liturgical Press (Roman Catholic)
Morehouse Group/Trinity Press (Episcopalian)
Paulist Press (Roman Catholic)
Pilgrim Press (United Church of Christ)
Society of Biblical Literature
Thomas Nelson Publishers
Westminster John Knox (Presbyterian Church USA)
University Presses, i.e. Oxford, Chicago, Yale, Baylor, UNC-Chapel Hill
Why the publisher matters
In doing academic work, you want to make sure that the books and journals you are using have been edited to a rigorous scholarly standard. One indication of this standard is the publisher. Besides commercial academic publishers (Routledge, Brill), there are publishers sponsored by scholarly associations (Society of Biblical Literature, National Association of Professors of Hebrew) and university presses (Yale, Oxford). In the field of religious studies, there are also publishers with a specific theological perspective (Eerdmans, IVP) or that are sponsored by a denomination (Abingdon, Liturgical).
Being aware of the publisher or source of any resource you use is important when one is doing research in areas that may have perspectives that vary across denominations or could be theologically contentious.